int main(int argc, char *argv[]) { char *char_ptr; int *int_ptr; int mem_size; if (argc < 2) { mem_size = 50; // Use 50 as default value if no CLI args present } else { mem_size = atoi(argv[1]); } printf("\t[+] allocating %d bytes of memory on the heap for char_ptr\n", mem_size); char_ptr = (char *) errorchecked_malloc(mem_size); strcpy(char_ptr, "this is memory located on the heap"); printf("char_ptr (%p) --> %s\n", char_ptr, char_ptr); printf("\t[+] allocating 12 bytes of memory on the heap for int_ptr\n"); int_ptr = (int *) errorchecked_malloc(12); *int_ptr = 31337; printf("int_ptr (%p) --> %d\n", int_ptr, *int_ptr); free(char_ptr); free(int_ptr); }
int main(int argc, char *argv[]) { char *char_ptr; // a char pointer int *int_ptr; // an integer pointer int mem_size; if (argc < 2) // if there aren't commandline arguments, mem_size = 50; // use 50 as the default value.. else mem_size = atoi(argv[1]); printf("\t[+] allocating %d bytes of memory on the heap for char_ptr\n", mem_size); char_ptr = (char *) errorchecked_malloc(mem_size); // allocating heap memory strcpy(char_ptr, "This is memory is located on the heap."); printf("char_ptr (%p) --> '%s'\n", char_ptr, char_ptr); printf("\t[+] allocating 12 bytes of memory on the heap for int_ptr\n"); int_ptr = (int *) errorchecked_malloc(12); // allocated heap memory again *int_ptr = 31337; // put the value of 31337 where int_ptr is pointing printf("int_ptr (%p) --> %d\n", int_ptr, *int_ptr); printf("\t[-] freeing char_ptr's heap memory...\n"); free(char_ptr); // freeing heap memory printf("\t[+] allocating another 15 bytes for char_ptr\n"); char_ptr = (char *) errorchecked_malloc(15); // allocating more heap memory strcpy(char_ptr, "new memory"); printf("char_ptr (%p) --> '%s'\n", char_ptr, char_ptr); printf("\t[-] freeing int_ptr's heap memory...\n"); free(int_ptr); // freeing heap memory printf("\t[-] freeing char_ptr's heap memory...\n"); free(char_ptr); // freeing the other block of heap memory }